According to conversations with the AA RTW desk (and reading between the lines), if your entire itinerary uses airlines with which AA has an electronic interline agreement, then you will get an e-ticket. As far as I know, AA, BA, CX, and QF have such arrangements. Not sure about the other OW airlines. I also inferred that if you have an e-ticket, it is limited to 16 segments and that it may be the procedure sooner than Guy Betsy has suggested in a prior post. Maybe time to add that IB segment to make sure you get a paper ticket and 20 segments. I was also told that SWISS is joining OW at the end of July.